Optionalapi_OptionalauthorizationOptionalbrand_Optionalcolor-Selects the colour scheme applied inside this <rechat-root>. "auto"
follows the viewer's OS preference (prefers-color-scheme); "light"
and "dark" force a mode. Like data-theme, it inherits through shadow
DOM to every nested Rechat element. Defaults to light when omitted.
Optionaldata-Selects which CSS theme block applies inside this <rechat-root>.
The default is "rechat". CSS variables inherit through shadow DOM,
so setting this attribute on <rechat-root> (or any ancestor such
as <body>) propagates the theme to every nested Rechat element
with zero JavaScript.
Attributes accepted by the
<rechat-root>tag — provides brand, authorization, and API URL context to every nested Rechat element.